OpenCode

OpenCode can use an OpenAI-compatible provider. Configure a provider that points to R9S and authenticate with your R9S API key.

Environment Variables

export R9S_API_KEY="<R9S_API_KEY>"

Configure Provider

Add an R9S provider to your OpenCode configuration:

{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "r9s": {
      "npm": "@ai-sdk/openai-compatible",
      "name": "R9S",
      "options": {
        "baseURL": "https://api.r9s.ai/"
      },
      "models": {
        "gpt-5-codex": {
          "name": "GPT-5 Codex"
        },
        "claude-sonnet-4.5": {
          "name": "Claude Sonnet 4.5"
        }
      }
    }
  }
}

Connect API Key

Launch OpenCode:

opencode

Then run:

/connect

Use R9S as the provider name and paste your R9S API key when prompted.

Run OpenCode

In OpenCode, open the model picker:

/models

Select gpt-5-codex, claude-sonnet-4.5, or another model listed in your R9S provider config.

Troubleshooting

Symptom	Check
Authentication error	Confirm the R9S provider key saved by OpenCode is your R9S API key.
Model not found	Confirm the model name exists in R9S and is listed in the provider config.
Requests go to a different provider	Confirm the selected model comes from the R9S provider.